AMD 3465 also potently inhibits the replication of X4HIV strains (IC50: 1-10 nM). However, it has no effect on CCR5-using (R5) viruses. AMD 3465 (GENZ-644494) is a potent antagonist of CXCR4, inhibits binding of 12G5 mAb and CXCL12AF647 to CXCR4, with IC
KRH-3955 hydrochloride is a CXCR4 antagonist with oral bioavailability. It effectively inhibits the binding of SDF-1α to CXCR4, exhibiting an IC 50 of 0.61 nM. Additionally, KRH-3955 hydrochloride displays high potency and selectivity as an inhibitor of X4HIV-1, with an EC 50 ranging from 0.3 to 1.0 nM.